<template>
    <div>
         <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <el-card>
             <!-- 提示区域 -->
            <el-alert
                title="添加商品的信息"
                type="info"
                :closable="false"
                center
                show-icon>
            </el-alert>

            <!-- 步骤图区域 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- 表单区域 -->
            <el-form :model="addForm" :rules="addRules" ref="addFormRef"
            label-width="100px" class="demo-ruleForm" label-position="top"

            >
            <!-- tabs栏区域 -->
             <el-tabs :tab-position="'left'"  v-model="activeIndex"
             :before-leave= "beforeTabLeave" @tab-click="tabClicked">
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                      <el-form-item label="商品价格" prop="goods_price">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                      <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight" type="number"></el-input>
                    </el-form-item>
                      <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                           <el-cascader
                            v-model="addForm.goods_cat"
                            :options="cateList"
                            expand-trigger="hover"
                            :props="cateProps"
                            @change="handleChange">
                      </el-cascader>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品参数" name="1">
                    <!-- 渲染表单的item项 -->
                    <el-form-item :label="item.attr_name" v-for="item in manyTabData" :key="item.attr_id">
                         <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox border :label="e" v-for="(e,i) in item.attr_vals" :key="i"></el-checkbox>
                        </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                    <el-form-item :label="item.attr_name" v-for="item in onlyTabData" :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                    <!-- action表示图片要上次的api地址 -->
                    <!-- on-preview处理图片的预览事件 -->
                    <el-upload
                        :headers= "headerObj"
                        :action="uploadURL"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        :on-success= "handleSuccess"
                        list-type="picture">
                        <el-button size="small" type="primary">点击上传</el-button>
                        <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
                        </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                    <!-- 富文本编辑器 -->
                     <quill-editor
                        ref="myQuillEditor"
                        v-model="addForm.goods_introduce"
                    />
                     <!-- 添加商品按钮 -->
                <el-button type="primary" class="addBtn" @click="addGoods">添加商品</el-button>
                </el-tab-pane>

            </el-tabs>
            </el-form>

            <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="50%"
          >
           <img :src="previewPath" alt="yoyo" class="previewImg">
            </el-dialog>
        </el-card>
    </div>
</template>
<script>
import _ from 'lodash'
export default {
  data () {
    return {
      activeIndex: '0',
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属分类数组
        goods_cat: [],
        pics: [],
        // 商品属性定义
        goods_introduce: '',
        attrs: []
      },
      manyTabData: [],
      onlyTabData: [],
      cateList: [],
      // 图片上传的地址
      uploadURL: 'http://47.115.124.102:8888/api/private/v1/upload',
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 图片上次组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 图片预览时的路径
      previewPath: '',
      previewVisible: false,
      addRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' },
          { min: 3, max: 5, message: '长度在 3 到 5 个字符', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选中商品分类', trigger: 'blur' }
        ]
      }
    }
  },
  created () {
    this.getCateList()
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.cateList = res.data
    },
    handleChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类')
        return false
      }
      if (oldActiveName === '0' && this.addForm.goods_name === '') {
        this.$message.error('请选择商品名称')
        return false
      }
    },
    async tabClicked () {
      // 证明访问的是动态参数面板
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
          { params: { sel: 'many' } })
        if (res.meta.status !== 200) {
          return this.$message.error(res.meta.msg)
        }
        res.data.forEach(item => {
          item.attr_vals =
          item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
        })
        this.manyTabData = res.data
        console.log(this.manyTabData)
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
          { params: { sel: 'only' } })
        if (res.meta.status !== 200) {
          return this.$message.error(res.meta.msg)
        }
        this.onlyTabData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview (file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理图片的移除操作
    handleRemove (file) {
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3.调用数组的splic方法，讲图片信息对象从pics数组中移除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    // 监听图片上传成功的操作
    handleSuccess (res) {
      // 1.拼接得到一个图片信息对象
      const picInfo = { pic: res.data.tmp_path }
      // 2.讲图片信息对象push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    // 添加商品
    addGoods () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.message.error('请添加必要的必填项')
        } else {
          // 执行添加的业务逻辑
          // loadlash cloneDeep
          const form = _.cloneDeep(this.addForm)
          form.goods_cat = form.goods_cat.join(',')
          // 处理动态参数
          this.manyTabData.forEach(item => {
            const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(',') }
            this.addForm.attrs.push(newInfo)
          })
          // 处理静态属性
          this.onlyTabData.forEach(item => {
            const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
            this.addForm.attrs.push(newInfo)
          })
          form.attr_vals = this.addForm.attrs
          console.log(form)
          const { data: res } = await this.$http.post('goods', form)
          if (res.meta.status !== 201) {
            return this.$message.error('添加商品失败')
          }
          this.$message.success('添加商品成功')
          this.$router.push('/goods')
        }
      })
    }
  }
}
</script>
<style lang="less" scoped>
.el-card{
    margin-top: 20px;
}
.el-steps{
    margin: 20px 0;
}
.el-checkbox{
    margin: 0 5px 5px 0;
}
.previewImg{
    width: 100%;
}
.addBtn{
    margin-top: 20px;
}
</style>
